I've noticed an issue with text styling, or more specifically - line spacing. Where the program does not seem to remember what the default line spacing is.

I've reproduced this issue in a new blank document, here's the steps I've used.

Firstly I went into Site Properties and change the Font Family, Size, and Line Height

If I now create a text box (and add text) it'll be Tahoma and size 12, but there will be no line spacing. I've demonstrated it below with the left text box being "as is" and the right with manually fixed line spacing

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As a side note if I have a textbox with line spacing (1.2 in this example) and I insert text I have copied from Notepad, it will also revert the line spacing to a non-default if I use Control+A. It does not happen if I drag a selection from the bottom of the text to the top

I do hope this is enough information and my descriptions are clear enough for you to understand.

The 'line-height' property does not affect the text in the workspace.
The option was mainly added to make sure the default line-height is the same for all browsers.
See also the information in the help.